ASVAB Electronics Information Practice Test 469084 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.16
Score	0%	63%

Review

A transistor to an electronic circuit is like a _______________ to a house?

68% Answer Correctly

	driveway
	safe
	no trespassing sign
	gate

Solution

A transistor works by allowing a small amount of current applied at the base to control general current flow from collector to emitter through the transistor. A transistor acts as a gate or switch for electronic signals.

In metals, increasing the temperature typically _____________ conductivity.

50% Answer Correctly

	eliminates
	increases
	does nothing to
	decreases

Solution

All conductors have resistance and the amount of resistance varies with the element. Metals exhibit increased resistance (and, therefore, lower conductivity) as their temperature increases.

Which of the following is a difference between a circuit breaker and a fuse?

80% Answer Correctly

	all of these
	a circuit breaker can be reused
	a fuse is cheaper than a circuit breaker
	a fuse responds more quickly than a circuit breaker

Solution

Like fuses, circuit breakers stop current flow once it reaches a certain amount. They have the advantage of being reusable (fuses must be replaced when "blown") but respond more slowly to current surges and are more expensive than fuses.

Which of the following is not a characteristic of a step-up transformer?

54% Answer Correctly

	has more turns in the secondary winding than in the primary winding
	the secondary voltage is higher than the primary voltage
	the primary voltage is higher than the secondary voltage
	increases voltage

Solution

As their names indicate, a step-up transformer is used to step up or increase voltage and a step-down transformer is used to step down or decrease voltage. In a step-up transformer, the secondary voltage is higher than the primary voltage and it has more turns in the secondary winding than in the primary winding.

5 How would you connect 6 [9V 15A] batteries to achieve a combined power output of 27V 45A?

66% Answer Correctly

	series
	orthogonal
	parallel
	series-parallel

Solution

Connecting the 6 batteries in series multiplies their voltage while keeping their current the same yielding a 54V 15A configuration. Connecting the 6 batteries in parallel multiplies their current while keeping their voltage the same yieleding a 9V 90A configuration. Using a series-parallel connection, 3 batteries can be connected in series and 3 can be connected in parallel resulting in a 27V 45A configuration.